During the recent years, changes in the economic, social and cultural fields, improving the health of society, decreasing fertility, followed by decreasing population growth and increasing life expectancy have led to significant changes in the country's population structure. The aforementioned macro trends, along with the driving factors, have had consequences for the population of the Islamic Republic of Iran. The purpose of this research is to determine the consequences of environmental macrotrends on changes in the age structure of the population of the Islamic Republic of Iran in the horizon of 1410 And therefore, the main issue of this research will be based on the purpose of the research, based on what this issue is. This research is a developmental-applied research and in terms of descriptive-analytical research method, which is collected by the library and field information collection methods, and after obtaining the opinion of the statistical community (42 people) about the data analysis using the statistical quantitative methods of the tables The frequency distribution and inferential analysis of the sample t-test statistical test and the average rank of the data have been carried out and then the conclusions have been drawn. The findings of the research show that 13 consequences affected by the four macro-environmental trends of individual changes, economic changes, cultural changes and social changes will affect the age structure of the country's population in the horizon of 1410